Fix for building shared libraries on AIX with 64-bit mode

Set building of shared libraries on QNX to defatul OFF


configure.in:
  -Libtool forgets to pass the -q64 and -X64 flags to "nm" and "xlc_r" when building
  for 64-bit on AIX. Add some hacks before we create libtool that fixes this.
  This test should be integrated into autoconf/libtool
  
  -Set default to not build shared librarues on QNX. When building libmysqlclient and libmysqlclient_r
  so many objects are passed to libtool that sh propably runs out of stack  and segfaults.

configure.in

@@ -218,6 +218,46 @@ then
 else
   AC_PATH_PROG(AS, as, as)
 fi
+
+# These checks has to be made befoe we buil libtool as they affect
+# what is written into libtool.
+case $SYSTEM_TYPE in
+    *aix5*)
+       # Find out which ABI we are using.
+      echo 'int i;' > conftest.$ac_ext
+      if AC_TRY_EVAL(ac_compile); then
+        case `/usr/bin/file conftest.$ac_objext` in
+        *"32-bit XCOFF"*)
+          # OBJECT_MODE=32
+          ;;
+         *"64-bit XCOFF"*)
+	   AC_MSG_WARN([Setting 64-bit mode for AIX 5.*])
+           # It was detected that compiler is using 64-bit mode
+	   # Set flags for CC and NM so that those tools will work
+           # in 64-bit mode when called from libtool
+	   # The easiest way fix this is "export OBJECT_MODE=64"
+	   CC="$CC -q64"
+	   CXX="$CXX -q64"
+	   if test "X${NM+set}" != Xset; then
+	     NM="/usr/bin/nm -B -X64"
+           fi
+          ;;
+	esac
+      fi
+      rm -rf conftest*
+    ;;
+    *qnx*)
+    # Don't build shared libraries on QNX as it will run out of
+    # stack and segfault
+    AC_MSG_WARN([Turning off building of shared libraries])
+    AC_DISABLE_SHARED
+    ;;
+    *)
+    ;;
+esac
+
+LINK= "OBJECT_MODE=64 $LINK"
+
 # Still need ranlib for readline; local static use only so no libtool.
 AC_PROG_RANLIB
 # We use libtool
@@ -229,6 +269,13 @@ AC_PROG_LIBTOOL
 LIBTOOL="$LIBTOOL --preserve-dup-deps"
 AC_SUBST(LIBTOOL)dnl
 
+AC_SUBST(NM)dnl
+
+# NM= "$NM -X64"
+#archive_expsym_cmds= `echo "$archive_expsym_cmds" | sed -e '/"$(CC)"//'`
+#archive_expsym_cmds= "$CC -q64 $archive_expsym_cmds"
+#  CXXFLAGS=`echo "$CXXFLAGS -Werror" | sed -e 's/-fbranch-probabilities//; s/-Wall//; s/-ansi//; s/-pedantic//; s/-Wcheck//'`
+
 #AC_LIBTOOL_DLOPEN AC_LIBTOOL_WIN32_DLL AC_DISABLE_FAST_INSTALL AC_DISABLE_SHARED AC_DISABLE_STATIC
 
 # AC_PROG_INSTALL